48 THE NAUTILUS. 



through the mud and sand. This may be the adult of the 

 preceding, and the identification is not at all certain. 



These notes are not written in he hopes of straightening 

 out the seeming tangle in the ranges and identification of the 

 different species of the genus Acteoci/na, but only to call atten- 

 tion to the matter. A careful comparison of the type speci- 

 mens with specimens from all along the coast will be required 

 to form any definite conclusion. It is hoped that others will 

 be able to throw more light on the subject. 



LAND SHELLS FBOM PALM CANYON, CALIFORNIA. AND THE 



GEAND CANYON. 



BY H. A. PILSBRY. 



Dr. C. Montague Cooke and his son C. M. Cooke 3d, col- 

 lected shells, as occasion offered, while en route westward in 

 June, among them the following : 



Micrarionta wolcottiavia (Bartsch). Palm Canyon, River- 

 side Co., Calif ornia. "Found under dead plants of one 

 species of low-growing cactus at the mouth of the canyon, 

 about 6 miles above Palm Springs." Small specimens, 15.5 

 to 21 mm. diameter, only one out of 13 exceeding 19 mm. 



Sonorella coloradoensis (Stearns). Bright Angel Trail, 

 Grand Canyon. Small, 15.3 mm. diam., like the Bass' Trail 

 specimens. 



OreoJielix s. depressa (Ckll.). "Collected along the Bright 

 Angel Trail, from about 1000 to 3400 ft. below the rim. I 

 found the first specimen very close to the last pine 011 the 

 trail, just below the foot of the high yellow cliffs. Dead 

 specimens were seen along the trail to just below the part of 

 the trail called Jacob's Ladder. Unfortunately, we were 

 with a rather large party and I had a mule that wouldn't 

 stop. I collected six specimens, which I am sending you, 

 and saw 15 or 20 additional along the trail." 



This species has been found high on the northern side of 

 the Canyon, but not until now on the southern side. 



Oreohelix yavapai angelica P. & F. About 50 ft. below the 

 rim, Bright Angel Trail, at "Hermit's Rest". 



